CN204649874U - A kind of platform district line loss is abnormal checks instrument - Google Patents

Abstract

The utility model mainly discloses an inspection instrument for abnormal line loss in the station area. The inspection instrument is installed at the outlet switch and the branch meter box of the station area. The quick-loading clamp is installed on the outgoing line side of the circuit breaker at the outlet switch and the branch meter box for collecting voltage; the split current transformer is installed on the outgoing line side of the circuit breaker at the outlet switch and the branch meter box, Used to collect current; the three-phase CT meter is connected to the quick-installation clamp and the open-close current transformer through wires, and the three-phase CT meter is provided with GPRS communication to transmit the collected voltage and current information to the master station system The module can quickly find abnormal points through the line loss audit instrument in the station area, shorten the judgment time, improve efficiency, improve the benchmarking index of line loss in the station area, and recover the economic loss of line loss.

Description

An inspection instrument for abnormal line loss in the station area

technical field

The utility model relates to an inspection instrument for abnormal line loss in a station area, which is mainly used for checking the line loss of a line in a station area.

Background technique

Informatization, automation, and interaction are the development directions of the electricity consumption information collection system. On the basis of full coverage of the collection, line loss data collection on the line is an important goal in this development direction. At present, there are still blind spots in this type of line loss data collection, which is characterized by branch lines in public substation areas and user access lines There is no separate collector, which undoubtedly increases the difficulty and time of abnormal line loss handling in the station area. Line loss rate is a comprehensive technical and economic index, its size can indicate the management level of power supply enterprises, and is closely related to its economic benefits. The line loss rate is also an important index for the country to implement the energy-saving policy and evaluate the power supply enterprises. The line loss in the low-voltage station area refers to the line loss caused by the voltage of 10kV and below. It accounts for a large proportion of the loss of the power system. Since it is not easy to detect and is easy to ignore, corresponding measures are taken to reduce the loss of the low-voltage station area. For my country's power grid, loss can save a lot of electric energy and has great potential for loss reduction and power saving. At present, the line loss in the station area can be divided into three categories according to the management level: 1. Theoretical line loss; 2. Technical line loss; 3. , Management line loss. The most prone to problems are the following aspects:

(1) For the station area with high line loss, it is difficult for the power department to take an effective way to troubleshoot the fault, because the scope is large, it may be a line fault, it may be an abnormal measurement equipment, etc., which requires a lot of manpower and material resources, and the vast majority Most of the human investigation work did not produce direct value;

(2) The existing power consumption information collection system is in a blind spot for block and segment line loss analysis under the station area, and it is difficult to provide effective means to assist in narrowing the scope of line loss fault analysis;

(3) When the line loss in the station area is high, it is especially necessary to reduce the scope of investigation by dividing into blocks and segments, but the current technical means cannot effectively support it.

Utility model content

The technical problem to be solved by the utility model is to provide a line loss abnormal inspection instrument for the station area, through which the abnormal point can be quickly found, the judgment time can be shortened, the investigation efficiency can be improved, and the line loss of the station area can be improved. Standard indicators, to restore the economic loss of line loss loss.

The technical solution of the utility model is: an inspection instrument for abnormal line loss in the station area. The inspection instrument is installed at the outlet switch and the branch meter box of the station area. Current transformer; the fast-loading clamp is installed on the outgoing line side of the circuit breaker at the outlet switch and the branch meter box, and is used to collect voltage; the split current transformer is installed on the outgoing line of the circuit breaker at the outlet switch and the branch meter box side, used to collect current; the three-phase CT meter is connected to the quick-installation clamp and the open-close current transformer through wires, and the three-phase CT meter is provided with a device for transmitting the collected voltage and current information to the master station system GPRS communication module.

Preferably, the auditor includes a meter box, and the three-phase CT meter is arranged in the meter box.

Preferably, the meter box is provided with an upper storage compartment and a lower storage compartment, the three-phase CT meter is fixed in the upper storage compartment, and the quick-loading clamp and the open-close current transformer are Separately placed in the two lower storage compartments.

Preferably, the partition plate between the lower storage compartment and the upper storage compartment is provided with wire slots for the passage of wires, and the side wall or bottom wall of the lower storage compartment is provided with through holes for wires to pass through. .

Preferably, the back of the meter box is provided with an arc-shaped hoop assembly. The hoop assembly includes a fixed plate and a movable plate fixed on the back of the meter box. The cross-sections of the fixed plate and the movable plate are both arc-shaped.

After adopting the technical scheme, the utility model has the following advantages:

The collected data communicates with the main station system to reduce the scope of line loss faults: by installing the corresponding station area line loss anomaly inspection instrument at the outlet switch and branch meter box, and using the GPRS communication module to remotely connect to the main station system, combined with the main station system The advanced line loss management system reduces the scope of line loss faults; it can also combine the metering data of residents' meters and public transformer meters to analyze line losses in sub-blocks.

Provide metering devices that can be quickly installed and disassembled: Traditionally, metering devices are installed at outlet switches and branch meter boxes, and it is often necessary to power off the line and install corresponding CTs and metering meters. The steps are complicated. But only for troubleshooting the problem of line loss, fast installation is also required. After the problem is checked, it can be quickly dismantled and reused. The quick-installation wire clip and the split current transformer in the utility model do not need to be powered off when they are connected. , and the installation and removal are very convenient, and the installation and removal process will not cause any adverse effects on the outlet switch and the branch meter box.

Description of drawings

Accompanying drawing 1 is the installation position schematic diagram of the present utility model;

Accompanying drawing 2 is the connection schematic diagram of the utility model and circuit breaker;

Accompanying drawing 3 is the three-dimensional structural representation of the utility model;

Accompanying drawing 4 is the schematic diagram of the back of the utility model;

Figure 5 is a schematic diagram of the electricity information collected at a certain branch.

Detailed ways

The specific embodiment of the utility model will be further described below in conjunction with accompanying drawing:

As shown in Figures 1 to 4, a line loss abnormality audit instrument in the station area, a circuit breaker 1 is installed at the outlet switch and branch meter box of the station area, and an audit instrument is installed on the circuit breaker. The audit instrument includes a three-phase CT meter 2 , the three-phase CT meter is connected with 7 wires, and the ends of the 4 wires are respectively equipped with quick-loading wire clips 3. The fast-loading wire clips can be fully plastic-enclosed crocodile clips, and the ends of the other 3 wires are equipped with open-close current Transformer 4, the fast-loading clamp is connected to the circuit breaker to measure the voltage, and the access points are the A phase, B phase, C phase and neutral line N phase on the circuit breaker, exactly 4 The wire can be conveniently and quickly connected to the circuit breaker to measure the voltage by using alligator clips. The split current transformer is installed at the outlet end of the circuit breaker to measure the current at the outlet end of the circuit breaker. The split current transformer is mainly installed on the outlet of the circuit breaker On the output wires, three open-close current transformers form a group, which is just equipped with 3 wires. This type of current transformer does not need to be powered off during installation and disassembly. It only needs to place the output wire harness of the circuit breaker in the open state. It can be placed inside the circular induction coil, which is very convenient. In actual operation, current transformers of different specifications can be selected according to the actual situation: such as 600A/5A, 400A/5A, 200A/5A, 100A/5A, etc., the three-phase The CT meter is equipped with a GPRS communication module that transmits the collected voltage or current information to the main station system, which can transmit the data to the main station system in time for data analysis. After using the audit system, the effect is very obvious: 1. With 1 Take a low-voltage station area as an example. By installing an abnormality checker and combining the line loss analysis and management software of the low-voltage station area, the line loss of the low-voltage station area can be reduced from 10% to about 3%. 100kWh), the monthly loss is reduced by 1400kWh/unit, the number of 1 county bureau is about 500, the monthly loss is reduced by 700,000kWh/unit, and the loss is saved by about 350,000 yuan/month; 2. The improvement of the line loss index of the station area , Indirectly also promoted the improvement of distribution network planning management, operation management, maintenance management, marketing power management, measurement management, copy verification and collection management, etc., and comprehensively improved the management level of power grid operating companies on equipment and users in the Taiwan area.

As shown in Figures 3 to 4, when the specific equipment is installed and collected, the audit instrument also includes a meter box 5. Due to the limited space in the meter box of the outlet switch and branch meter box in use, it is difficult to place a three-phase CT meter, so this plan uses a special meter box to place the three-phase CT meter. The meter box includes the box body and the upper cover. When using the box body, it is installed next to the outlet switch and the branch meter box, which is convenient for installation and removal. , the box body is provided with an upper storage compartment and a lower storage compartment, the three-phase CT meter is fixed in the upper storage compartment, and the quick-loading clamp and the open-close current transformer are respectively placed in the The two lower storage compartments make it more convenient for inspectors to carry them when not in use. The relevant wire harnesses can be put into the lower storage compartments together with the quick-release wire clamp and the open-close current transformer after being coiled. In addition, in order to make the wiring harness of the auditory instrument not appear messy during normal use, the partition plate between the lower storage compartment and the upper storage compartment is provided with a wire groove 51 for the passage of the wire, and the wire groove on the partition board can be Set multiple, according to the number of wires in the utility model, the two lower storage compartments can be respectively provided with 3 wire slots and 4 wire slots, so that the lines are more clear, and the side wall or bottom wall of the lower storage compartment is provided with wires The through hole 52 for passing through, because the quick-loading clamp and the open-close current transformer must be connected to the circuit breaker, so its wires will eventually extend out of the meter box, and these wires are set in order to facilitate the passing of these wires. Finally, in order to facilitate the disassembly and assembly of the meter box, the back of the meter box is provided with an arc-shaped hoop assembly 53, and the hoop assembly includes a fixed plate 531 and a movable plate 532 fixed on the back of the meter box. The cross-sections of the fixed plate and the movable plate are both arc-shaped, and the meter boxes are generally fixed on utility poles or PVC pipes, so the arc-shaped shape is very suitable for installation and disassembly.

For the line loss analysis software of the master station system, the master station system includes a GPRS receiving module for timing or manually receiving transmission signals from the GPRS communication module, the GPRS receiving module is connected with a data analysis module, and the data analysis module converts the data Exporting charts or tables for display can make the received data more intuitive. The specific analysis methods are as follows:

The data analysis module calculates the received voltage and current information according to the built-in line loss calculation formula to calculate the line loss rate between the public terminal variable and the branch, and the line loss rate = public transformer terminal power - branch total power / public transformer total For electricity, when the line loss rate is greater than 8%, it is generally considered that there is a fault in its branch. The main influencing factors are: a. The transformation ratio of the current transformer is wrong, and the system transformation ratio is larger than the field transformation ratio; b. The public transformer terminal error is large, go fast. When the line loss rate is less than 0%, the main influencing factors are: a. The transformation ratio of the current transformer is wrong, and the system transformation ratio is smaller than the on-site transformation ratio; The polarity between the public transformer terminals is reversed; d. Miswiring between the current transformer and the public transformer terminal; e. The phase failure between the current transformer and the public transformer terminal (current phase loss, voltage phase loss) ; f, any screw between the current transformer and the public transformer terminal is not tightened; g, power factor problem. When the line loss rate is greater than 8% or less than 0%, focus on checking the power usage at the branch; the data analysis module can also be used to analyze the branch power and the user power of the access point under the branch, that is, the data analysis module calculates according to the line loss calculation formula The line loss between the branch power and the access point user power under the branch power, the line loss rate = the branch power - the branch user power / the branch power, when the line loss rate is greater than 8%, there must be a problem with the branch; data analysis module It can also be used to compare and analyze the branch phase-separated power and the user power of the access point of the corresponding phase, that is, if the line loss rate of a certain phase is greater than 8%, and the line loss rate of other phases is within the normal range, the user of this phase can be locked, and the investigation can be done in this way The workload will be much less, and the effect will be the best.

In addition, the data analysis module includes a data archiving module for importing the electricity consumption data of users in the sub-area, so that the data collected on site can be compared with the previously imported user electricity consumption data, and it can also be imported into users in other communities for data comparison , to find differences and improvements. In addition, according to the actual situation of each region, the data calculation module includes a line loss formula customization module, that is, the user can customize the total measurement unit or sub-measurement unit, or customize Line loss calculation formula, etc.

For a specific analysis example, taking the data in Figure 5 as an example, the public transformer terminal power is 104.55-(A1-1 branch power 46.08)-(A2-1 branch power 58.45)=0.02kWh, and the line loss power is only 0.02kWh;

And A1-1 branch A-phase power 21.15-A-phase user power 21.07=0.08kWh, line loss power is only 0.08kWh; A1-1 branch B-phase power 10.12-B-phase user power 10.08=0.04kWh, line loss power is only 0.04kWh ; while A1-1 branch C-phase power 14.81-C-phase user power 14.78=0.03kWh, line loss power is only 0.03kWh;

And A2-1 branch A-phase power 51.15-A-phase user power 39.47=11.68kWh, line loss power is 11.68kWh; A2-1 branch B-phase power 7.29-B-phase user power 7.26=0.03kWh, line loss power is only 0.03 kWh; while A2-1 branch C-phase power 0.01-C-phase user power 0=0.01kWh, line loss power is only 0.01kWh; thus it can be seen that the problem lies in the A-phase users of A2-1 branch, which is very targeted.

In actual operation, the method of checking the branch is as follows:

a. Use the line loss anomaly inspector in the station area to collect data and analyze relevant data in combination with the system master station;

b. On-site inspection: 3 to 5 people in one station will check, and one person will be responsible for 20 to 40 meters, and carefully check whether there are any conditions for privately connecting wires on the branch line or next to the access point and the down line, etc., such as Check carefully whether there are lap marks or arc burn marks;

c. After opening the cover and inspecting, the seal must be sealed. If there are abnormal clocks, alarms, reverse polarity indications, etc. during the inspection, please record them;

d. Observe the line damage in a few days, if there is still a problem, go to the site to check, open the cover and observe whether the seal is intact, if there is damage, there must be a problem;

e. If there is no abnormality, there are reasons to suspect other problems: branch phase separation and heavy load, whether the power supply radius of the line is too large, whether the wire diameter is too small and other reasons.

The above is only a description of the preferred examples of the utility model, but should not be construed as a limitation on the claims. The utility model is not only limited to the above examples, but its specific structure is allowed to change. Those skilled in the art can make various changes and deformations according to the utility model. As long as they do not depart from the spirit of the utility model, all should belong to the rights attached to the utility model. The scope defined by the requirement.

Claims (5)

1. a Zhong Tai district line loss is abnormal checks instrument, this checks that instrument is installed on outlet switch, the branch list case place in platform district, it is characterized in that: this checks that instrument comprises three-phase CT and shows (2), fast-assembling wire clamp (3) and open-close type current transformer (4); Described fast-assembling wire clamp is arranged on the breaker outgoing line side at outlet switch, branch list case place, for gathering voltage; Described open-close type current transformer is arranged on the breaker outgoing line side at outlet switch, branch list case place, for gathering electric current; Described three-phase CT table is connected by wire with fast-assembling wire clamp and open-close type current transformer, and described three-phase CT table is provided with the GPRS communication module voltage of collection and current information being transferred to main station system.

2. a kind of platform district according to claim 1 line loss is abnormal checks instrument, it is characterized in that: instrument comprises meter table case (5) in described checking, described three-phase CT table is located in meter table case.

3. a kind of platform district according to claim 2 line loss is abnormal checks instrument; it is characterized in that: described meter table case is provided with top matter storage lattice and bottom matter storage lattice; three-phase CT table is fixed in the matter storage lattice of top, and described fast-assembling wire clamp and open-close type current transformer are placed on respectively when not using in two bottom matter storage lattices.

4. a kind of platform district according to claim 3 line loss is abnormal checks instrument; it is characterized in that: the demarcation strip between described bottom matter storage lattice and top matter storage lattice is provided with the wire casing (51) facilitating wire to pass through, bottom matter storage lattice sidewall or diapire are provided with the through hole (52) passed for wire.

5. a kind of platform district according to claim 2 line loss is abnormal checks instrument; it is characterized in that: described meter table case back is provided with circular arc hoop component (53); hoop component comprises the fixed head (531) and portable plate (532) that are fixed on meter table case back, and the xsect of fixed head and portable plate is circular arc.